Sparklines are a new charting feature in Excel 2010 that allows you to insert charts into a single cell. There are 3 types of charts (line, column, and win/loss) that make up Sparklines. Before you are ready to insert Sparklines, make sure that you have a continguous series of numerical data. The series of data can make up either a row or column.
To create a Sparkline, first click in the cell you wish to display it in. Second, Click the Insert tab and click the type of Sparkline you desire (line, column or win/loss). Third, drag your mouse to input the data range. Verrify that the location range is already entered based on the active cell. Forth, click OK. Tip: you can left click and drag the auto-fill handle (the tiny black square at the bottom of the cell) to copy the Sparklines to adjacient rows or columns.